A hemispherical centrifugal extrusion magnetorheological soft starter

Abstract

The invention discloses a hemispherical centrifugal extrusion magnetorheological soft starter, comprising a driving shaft, a driven housing and a driven shaft, wherein the inner cavity of the driven housing is spherical; a spherical transmission sphere is arranged in the driven housing, and a magnetorheological fluid is filled between the surface of the transmission sphere and the inner side surface of the driven housing; the transmission sphere comprises a first hemisphere and a second hemisphere, and a receiving groove is arranged on a side adjacent to the first hemisphere and the second hemisphere, a transmission shaft is arranged on both sides of the driving shaft, a shape memory alloy spring is sleeved on the transmission shaft, a guide column is arranged at the bottom of the receiving groove, a guide hole coaxial with the guide column is arranged on the transmission shaft, and the guide column extends into the guide hole. The invention can not only improve the maximum torque transmitted by the soft starter, but also ensure the transmission performance of the soft starter at high temperature.

Description

Technical Field

[0001] The invention relates to the technical field of power transmission, in particular to a starting device between a prime mover and a working machine, and specifically to a hemispherical centrifugal extrusion magnetorheological soft starter. Background Art

[0002] Traditional mechanical starting devices are prone to mechanical shock when starting, which affects the service life of the mechanical device, especially when starting with load, the mechanical shock is more obvious. Shape memory alloy is a new type of intelligent material. After a certain degree of deformation under certain conditions, the shape memory alloy with a certain initial shape will undergo reverse deformation by appropriately changing the temperature, so that the material returns to its initial shape. In the process of shape recovery, if the shape memory alloy is constrained, it will generate a large restoring force, and its restoring force can be used to do external work; magnetorheological fluid is a two-phase suspension that can change from a fluid to a solid or gel-like state under the action of an external magnetic field. The change of magnetorheological fluid is reversible. Under the action of an external magnetic field, the magnetically polarized particles can form a dipole moment, so that the particles form a chain-like or columnar structure parallel to the direction of the magnetic field, resulting in a change in the phase state of the magnetorheological fluid, an increase in the apparent viscosity of the magnetorheological fluid, and a high yield stress, which can be used to transmit torque.

[0003] Due to their respective characteristics, shape memory alloys and magnetorheological fluids have broad prospects in the field of mechanics. For example, CN103089863A discloses a radial extrusion magnetorheological fluid brake, which is relatively simple in structure and can not only provide a large braking torque, but also enhance the reliability of the device and reduce energy consumption. The "wheel initial deceleration brake based on magnetorheological fluid" disclosed in CN105650148A arranges magnetorheological fluid in the brake working chamber, and applies a driving magnetic field to the magnetorheological fluid through an electromagnetic coil to change the viscosity of the magnetorheological fluid, so that the magnetorheological fluid causes resistance to the brake wheel, and performs wear-free braking deceleration for the initial braking section under high-speed conditions; the "multi-plate magnetorheological fluid electromagnetic clutch" disclosed in CN103603891A uses a multi-plate structure and magnetorheological fluid as a medium to fill the gaps between multiple master and slave friction plates of the electromagnetic clutch to form multiple magnetorheological fluid working annular surfaces. The gap magnetic field has a large intensity, a reasonable distribution, and a large transmission torque. A small excitation current can be used to control a large transmission power, and automatic control can be easily realized to ensure the smoothness of the engagement and separation processes; the "shape memory alloy controlled engine fan" disclosed in CN202220651U uses a shape memory alloy spring to sense temperature, realize the control of the magnetic force, and then control the air volume of the fan.

[0004] There are more and more studies on the application of magnetorheological fluid in transmission, but the yield stress of magnetorheological fluid is small under normal conditions and cannot meet the needs of transmitting high-power power. The yield stress of magnetorheological fluid can be increased by the extrusion strengthening effect, thereby increasing its transmission power. However, how to reasonably apply the extrusion strengthening effect is a difficult problem in the current magnetorheological fluid transmission device; and the performance of magnetorheological fluid will decrease with the increase of ambient temperature, which cannot meet the working requirements under different temperature environments. The shape memory effect of shape memory alloy can be used to make up for the defects of magnetorheological fluid in transmission. Although researchers have done a lot of research on the separate applications of shape memory alloys and magnetorheological fluids in the field of transmission engineering, there is still little research on the joint application of shape memory alloys and magnetorheological fluids in transmission devices. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the problems that the existing soft starter transmits small torque, low transmission efficiency and poor transmission stability at high temperature, and to provide a hemispherical centrifugal extrusion magnetorheological soft starter, which can pressurize the magnetorheological fluid in the working gap by centrifugal force, thereby increasing the maximum torque transmitted by the soft starter; and can assist the soft starter in transmitting torque by memory alloy, thereby ensuring the transmission performance of the soft starter at high temperature.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: a hemispherical centrifugal extrusion magnetorheological soft starter, comprising a driving shaft, a driven housing and a driven shaft, the driven housing comprising a left housing and a right housing, the left housing and the right housing being fixedly connected; one end of the driving shaft passes through the right housing and then extends into the driven housing, and is connected to the left housing and the right housing through a bearing, and one end of the driven shaft is fixedly connected to the left housing; a coil groove is formed at the connection between the left housing and the right housing, and an excitation coil is wound in the coil groove; a magnetic isolation ring is provided on the inner side of the coil groove, and the coil is enclosed in the coil groove by the magnetic isolation ring; it is characterized in that: the inner cavity of the driven housing is spherical; a spherical transmission sphere is provided in the driven housing, the transmission sphere has an axial hole arranged along its radial direction, and is sleeved on the driving shaft through the axial hole, and there is a gap between the surface of the transmission sphere and the inner side surface of the driven housing, and the gap is filled with magnetorheological fluid;

[0007] The transmission sphere includes a first hemisphere and a second hemisphere, and the first hemisphere and the second hemisphere are distributed on both sides of the driving shaft; in the driven housing, a plurality of rubber support blocks are arranged around the first hemisphere and the second hemisphere, and under the action of the rubber support blocks, the first hemisphere and the second hemisphere are fitted together;

[0008] A receiving groove is respectively provided along the radial direction of a side surface adjacent to the first hemisphere and the second hemisphere, and the axial direction of the receiving groove is perpendicular to the contacting side surface of the first hemisphere and the second hemisphere; a transmission shaft is respectively provided at the positions corresponding to the receiving groove on both sides of the driving shaft, the axial direction of the transmission shaft is consistent with the axial direction of the receiving groove, one end of the transmission shaft is fixedly connected to the driving shaft, and the other end extends to the bottom of the groove close to the receiving groove; a shape memory alloy spring is sleeved on the transmission shaft, one end of the shape memory alloy spring is fixedly connected to the driving shaft, and the other end is fixedly connected to the bottom of the groove;

[0009] A guide column coaxial with the center line of the accommodating groove is also provided at the bottom of the accommodating groove. At one end of the transmission shaft close to the bottom of the accommodating groove, a guide hole coaxial with the center line of the guide column is provided at a position corresponding to the guide column. One end of the guide column is fixedly connected to the bottom of the accommodating groove, and the other end extends into the guide hole and forms a sliding fit with the side wall of the guide hole.

[0010] Furthermore, the rubber support block is located on the same circumference as the transmission sphere, and the plane where the rubber support block is located is perpendicular to the axis of the driving shaft.

[0011] Furthermore, the rubber support block is arc-shaped, one side of which is in close contact with the magnetic isolation ring, and the other side of which is in close contact with the transmission ball.

[0012] Furthermore, a threaded hole is provided on the driving shaft at a position corresponding to the transmission shaft, and the threaded hole penetrates the driving shaft in a radial direction; one end of the transmission shaft connected to the driving shaft has an external thread matching the threaded hole, and the transmission shaft and the driving shaft are connected together through threaded matching.

[0013] Furthermore, a retaining ring is provided on both sides of the transmission ball, and a clamping groove is provided on the driving shaft at positions corresponding to both sides of the transmission ball. The retaining ring is sleeved on the driving shaft and installed in the two clamping grooves accordingly.

[0014] Furthermore, a brush slip ring is sleeved on the driven shaft, the brush slip ring is fixedly connected to the driven shaft, and both ends of the excitation coil are connected to the brush slip ring.

[0015] Furthermore, a liquid injection hole is provided on the left shell or the right shell, and a liquid injection screw plug is matched in the oil injection hole.

[0016] Furthermore, the bearing is a sealed bearing.

[0017] Furthermore, a blind cover is provided at the left end of the driven housing, the blind cover is fixedly connected to the left housing and closes the left housing; the driven shaft is fixedly connected to the blind cover.

[0018] Furthermore, a transparent cover is provided at the right end of the driven housing, the transparent cover is sleeved on the driving shaft and fixedly connected to the right housing, and a felt ring is provided between the transparent cover and the driving shaft.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. When the driving shaft starts gradually, the first hemisphere and the second hemisphere squeeze the magnetorheological fluid in the working gap under the action of centrifugal force, and the magnetorheological fluid in the working gap will be squeezed to produce an extrusion strengthening effect, and the extrusion strengthening effect of the magnetorheological fluid increases with the increase of the driving shaft speed, thereby improving the maximum torque transmitted by the soft start device.

[0021] 2. The overall structure is simple. The working area of ​​the magnetorheological fluid is designed as a spherical gap, which greatly increases the effective area of ​​the magnetorheological fluid, thereby greatly increasing the maximum torque that the clutch can transmit and effectively improving the transmission efficiency. When transmitting the same torque, the magnetorheological fluid soft starter with a spherical gap has a more compact structure and smaller moment of inertia, which is conducive to rapid response during soft starting.

[0022] 3. When the temperature rises and the transmission performance of the magnetorheological fluid decreases, the spring made of shape memory alloy between the first hemisphere, the second hemisphere and the driving shaft generates a restoring force under the action of thermal effect to push the first hemisphere and the second hemisphere to squeeze the magnetorheological fluid radially along the driving shaft, thereby enhancing the extrusion strengthening effect of the magnetorheological fluid, thereby ensuring the transmission performance of the soft starter under different temperature conditions and making the transmission performance of the soft starter more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention.

[0024] Figure 2 for Figure 1 Cross-section view along the AA direction.

[0025] Figure 3 for Figure 1 Enlarged view of part B in the middle.

[0026] Figure 4 This is the relationship diagram between torque and speed.

[0027] In the figure: 1—driving shaft, 2—driven shaft, 3—left housing, 4—right housing, 5—excitation coil, 6—magnetic isolation ring, 7—first hemisphere, 8—second hemisphere, 9—magnetorheological fluid, 10—rubber support block, 11—transmission shaft, 12—shape memory alloy spring, 13—guide shaft, 14—brush slip ring, 15—retaining ring, 16—liquid injection plug, 17—sealed cover, 18—transparent cover. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] Example: See Figures 1 to 4 A hemispherical centrifugal extrusion magnetorheological soft starter comprises a driving shaft 1, a driven housing and a driven shaft 2. The driven housing comprises a left housing 3 and a right housing 4, and the left housing 3 and the right housing 4 are fixedly connected. One end (left end) of the driving shaft 1 passes through the right housing 4 and then extends into the driven housing, and is connected to the left housing 3 and the right housing 4 through a bearing; one end (right end) of the driven shaft 2 is fixedly connected to the left housing 3. In the specific implementation, the bearing adopts a sealed bearing; thereby avoiding the internal sealing effect of the driven housing to be better. A blind cover 17 is provided at the left end of the driven housing, and the blind cover 17 is fixedly connected to the left housing 3 and closes the left housing 3; the driven shaft 2 is fixedly connected to the blind cover 17, and in order to improve the strength and connection stability of the driven shaft 2 and the blind cover 17, the driven shaft 2 and the blind cover 17 are formed as one body. During the assembly process, the driving shaft 1 and the driven shaft 2 and the driven housing are arranged coaxially, so as to ensure the working stability of the entire soft starter. A transparent cover 18 is provided at the right end of the driven housing. The transparent cover 18 is sleeved on the driving shaft 1 and fixedly connected to the right housing 4. A felt ring is provided between the transparent cover 18 and the driving shaft 1. By providing a cover 17 and a transparent cover 18, and using a felt ring to seal the gap between the transparent cover 18 and the driving shaft 1, the sealing effect of the driven housing can be further improved. A coil groove is formed at the connection between the left housing 3 and the right housing 4, and an excitation coil 5 is wound in the coil groove; a magnetic isolation ring 6 is provided on the inner side of the coil groove, and the coil is enclosed in the coil groove by the magnetic isolation ring 6. During implementation, a brush slip ring 14 is also sleeved on the driven shaft 2, and the brush slip ring 14 is fixedly connected to the driven shaft 2, and the two ends of the excitation coil 5 are connected to the brush slip ring 14; in this way, it is easier to connect and install the excitation coil 5.

[0030] The left shell 3 and the right shell 4 are both hemispherical shells. After the left shell 3 and the right shell 4 are connected, the inner cavity of the driven shell is spherical. A spherical transmission ball is provided in the driven shell. The transmission ball has an axial hole arranged along its radial direction, and is sleeved on the driving shaft 1 through the axial hole. There is a gap between the surface of the transmission ball and the inner side surface of the driven shell, wherein the size of the gap between the surface of the transmission ball and the inner side surface of the driven shell is consistent. A retaining ring 15 is provided on both sides of the transmission ball, and a card slot is provided on the driving shaft 1 at the position corresponding to the two sides of the transmission ball. The retaining ring 15 is sleeved on the driving shaft 1 and installed in the two card slots accordingly; thereby realizing the axial positioning of the transmission ball. The gap is filled with magnetorheological fluid 9; a liquid injection hole is provided on the left shell 3 or the right shell 4, and a liquid injection screw plug 16 is provided in the oil injection hole to facilitate the injection and replacement of the magnetorheological fluid 9.

[0031] The transmission sphere includes a first hemisphere 7 and a second hemisphere 8, and the first hemisphere 7 and the second hemisphere 8 are distributed on both sides of the driving shaft 1; an arc groove is provided on the side adjacent to the first hemisphere 7 and the second hemisphere 8, corresponding to the position of the driving shaft 1, and when the first hemisphere 7 and the second hemisphere 8 are fitted, the two arc grooves cooperate to form an axial hole. In the driven housing, a plurality of rubber support blocks 10 are provided around the first hemisphere 7 and the second hemisphere 8, and under the action of the rubber support blocks 10, the first hemisphere 7 and the second hemisphere 8 are fitted together. In the specific implementation, the rubber support block 10 is located on the same circumference concentric with the transmission sphere, and the plane where the rubber support block 10 is located is perpendicular to the axis of the driving shaft 1; in this way, the rubber support block 10 has a better supporting effect on the first hemisphere 7 and the second hemisphere 8. In order to further improve the supporting effect, the rubber support block 10 is arc-shaped, one side of which is in close contact with the magnetic isolation ring 6, and the other side is in close contact with the transmission sphere.

[0032] A receiving groove is provided along the radial direction of the side surface adjacent to the first hemisphere 7 and the second hemisphere 8, and the axial direction of the receiving groove is perpendicular to the side surface in contact with the first hemisphere 7 and the second hemisphere 8. A transmission shaft 11 is provided on both sides of the driving shaft 1 at the positions corresponding to the receiving grooves, and the axial direction of the transmission shaft 11 is consistent with the axial direction of the receiving groove, one end of the transmission shaft 11 is fixedly connected to the driving shaft 1, and the other end extends to the bottom of the groove close to the receiving groove. In specific implementation, a threaded hole is provided on the driving shaft 1 at the position corresponding to the transmission shaft 11, and the threaded hole penetrates the driving shaft 1 along the radial direction of the driving shaft 1; the end of the transmission shaft 11 connected to the driving shaft 1 has an external thread matched with the threaded hole, and the transmission shaft 11 is connected to the driving shaft 1 through the threaded match; in this way, the installation of the transmission shaft 11 is more convenient and quick, and the stability is better. A shape memory alloy spring 12 is sleeved on the transmission shaft 11, and one end of the shape memory alloy spring 12 is fixedly connected to the driving shaft 1, and the other end is fixedly connected to the bottom of the groove of the receiving groove.

[0033] A guide column 13 coaxial with the center line of the accommodating groove is also provided at the bottom of the accommodating groove. At the end of the transmission shaft 11 close to the bottom of the accommodating groove, a guide hole coaxial with the center line of the guide column 13 is provided at a position corresponding to the guide column 13. One end of the guide column 13 is fixedly connected to the bottom of the accommodating groove, and the other end extends into the guide hole and forms a sliding fit with the side wall of the guide hole.

[0034] During operation, the excitation coil 5 is energized to generate a magnetic field acting on the magnetorheological fluid 9, so that the magnetorheological fluid 9 solidifies. The friction between the solidified magnetorheological fluid 9 and the surface of the transmission ball and the driven housing increases. When the driving shaft 1 rotates, the torque output by the driving shaft 1 is transmitted to the driven housing through the solidified magnetorheological fluid 9, and then transmitted to the driven shaft 2 through the driven housing, thereby driving the driven shaft 2 to rotate; since the gap between the driven housing and the transmission ball is a spherical gap, the contact area between the magnetorheological fluid 9 and the driven housing and the transmission ball is greatly increased, so that the friction force is greatly increased, and then the transmitted torque is greatly increased.

[0035] During work:

[0036] 1. In the initial state, when the temperature of the soft starter is lower than a certain temperature (such as 60°C), the shape memory alloy spring 12 does not deform. Under the support of the rubber support block 10, the first hemisphere 7 and the second hemisphere 8 maintain their initial positions, that is, they are tightly attached together; the excitation coil 5 is not energized, and the torque transmitted by the viscosity of the zero magnetic field of the magnetorheological fluid 9 cannot drive the driven shaft 2 to rotate.

[0037] 2. The soft start starter is started at the same time as the prime mover. That is, after the excitation coil 5 is energized, a magnetic field is generated to act on the magnetorheological fluid 9, causing it to produce a rheological effect (solidification). The shear stress increases significantly, the driving shaft 1 begins to transmit torque, and the speed of the driven shaft 2 begins to gradually increase. In addition, since the working gap of the magnetorheological fluid 9 is spherical in shape, the effective area of ​​the magnetorheological fluid 9 is increased, thereby increasing the torque transmitted by the soft starter.

[0038] 3. As the driven shaft 2 rotates faster, the first plate sphere and the second hemisphere 8 squeeze the magnetorheological fluid 9 along the radial direction of the driving shaft 1 under the action of centrifugal force. Since the magnetorheological fluid 9 has solidified at this time, the magnetorheological fluid 9 is squeezed to produce an extrusion strengthening effect, thereby improving the transmission efficiency; and the higher the speed of the soft starter, the better the performance (the greater the transmission torque), which is suitable for high-speed and high-torque soft starting applications.

[0039] 4. The temperature of the soft starter gradually increases during transmission. When the temperature of the magnetorheological fluid 9 reaches the critical value of failure (such as 100°C), the performance of the magnetorheological fluid 9 decreases significantly. At this time, the shape memory alloy spring 12 extends under the action of the thermal effect to help push the first plate sphere and the second hemisphere 8, thereby enhancing the extrusion force of the first plate sphere and the second hemisphere 8 on the magnetorheological fluid 9, thereby further making the extrusion strengthening effect of the magnetorheological fluid 9 more obvious, thus compensating for the decline in the performance of the magnetorheological fluid 9, thereby ensuring the transmission performance of the soft starter at high temperature, and making the transmission performance of the soft starter more stable and reliable.

[0040] As a specific implementation:

[0041] The magnetorheological fluid produces an extrusion strengthening effect under the extrusion of centrifugal force. Assuming that the mass of the first hemisphere and the second hemisphere is 0.22kg, the radius of the center of mass is 0.01m, and the radius of the hemisphere is 0.025m; the shear yield stress of the un-extruded magnetorheological fluid is 43kPa. The relationship between the rotation speed and the extrusion shear yield stress is shown in Table 1. When the external magnetic field intensity is 100kAmp / m and the rotation speed increases from 0rpm to 5000rpm, the extrusion stress generated by the centrifugal force increases from 1.67kPa to 166.94kPa. The maximum shear yield stress and the transmitted torque of the magnetorheological fluid increase with the increase of the rotation speed. Compared with the shear stress of 43kPa when not extruded, the shear stress at a rotation speed of 5000rpm is 88.84kPa. The theoretical value of the torque transmitted by the soft start device is as follows Figure 4 As shown, the torque transmitted when not squeezed is 6.2N . m, when the speed is 5000rpm, the centrifugal extrusion strengthening increases the torque transmitted by the soft starter to 12.8N . m, the torque transmitted by extrusion is increased by 106.6% compared with that without extrusion. Therefore, the higher the speed of the soft starter, the better the performance, which is suitable for high-speed and high-torque soft starting applications.

[0042] Table 1 Relationship between rotation speed and extrusion shear yield stress

[0043]

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Those skilled in the art should understand that those modifications or equivalent substitutions of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. A magnetorheological soft starter based on centrifugal extrusion of a hemispherical body, comprising a driving shaft, a driven housing and a driven shaft, wherein the driven housing comprises a left housing and a right housing, wherein the left housing and the right housing are fixedly connected; one end of the driving shaft passes through the right housing and then extends into the driven housing, and is connected to the left housing and the right housing through a bearing, and one end of the driven shaft is fixedly connected to the left housing; a coil groove is formed at the connection between the left housing and the right housing, and an excitation coil is wound in the coil groove; a magnetic isolation ring is provided on the inner side of the coil groove, and the coil is enclosed in the coil groove by the magnetic isolation ring; the characteristics are: The inner cavity of the driven housing is spherical; a spherical transmission ball is arranged in the driven housing, the transmission ball has an axial hole arranged along its radial direction, and is sleeved on the driving shaft through the axial hole, and there is a gap between the surface of the transmission ball and the inner side of the driven housing, and the gap is filled with magnetorheological fluid; The transmission sphere includes a first hemisphere and a second hemisphere, and the first hemisphere and the second hemisphere are distributed on both sides of the driving shaft; in the driven housing, a plurality of rubber support blocks are arranged around the first hemisphere and the second hemisphere, and under the action of the rubber support blocks, the first hemisphere and the second hemisphere are fitted together; the rubber support blocks are located on the same circumference concentric with the transmission sphere, and the plane where the rubber support blocks are located is perpendicular to the axis of the driving shaft; the rubber support blocks are arc-shaped, one side of which is in close contact with the magnetic isolation ring, and the other side is in close contact with the transmission sphere; A receiving groove is respectively provided along the radial direction of a side surface adjacent to the first hemisphere and the second hemisphere, and the axial direction of the receiving groove is perpendicular to the contacting side surface of the first hemisphere and the second hemisphere; a transmission shaft is respectively provided at the positions corresponding to the receiving groove on both sides of the driving shaft, the axial direction of the transmission shaft is consistent with the axial direction of the receiving groove, one end of the transmission shaft is fixedly connected to the driving shaft, and the other end extends to the bottom of the groove close to the receiving groove; a shape memory alloy spring is sleeved on the transmission shaft, one end of the shape memory alloy spring is fixedly connected to the driving shaft, and the other end is fixedly connected to the bottom of the groove; A guide column coaxial with the center line of the accommodating groove is also provided at the bottom of the accommodating groove. A guide hole coaxial with the center line of the guide column is provided at the end of the transmission shaft close to the bottom of the accommodating groove at a position corresponding to the guide column. One end of the guide column is fixedly connected to the bottom of the accommodating groove, and the other end extends into the guide hole and forms a sliding fit with the side wall of the guide hole. A threaded hole is provided on the driving shaft at a position corresponding to the transmission shaft, and the threaded hole penetrates the driving shaft in the radial direction of the driving shaft. The end of the transmission shaft connected to the driving shaft has an external thread matching the threaded hole, and the transmission shaft and the driving shaft are connected together by threaded fit.

2. The magnetorheological soft starter based on hemispherical centrifugal extrusion according to claim 1 is characterized in that: A retaining ring is respectively arranged on both sides of the transmission ball, and a clamping groove is respectively arranged on the driving shaft at positions corresponding to both sides of the transmission ball. The retaining ring is sleeved on the driving shaft and installed in the two clamping grooves accordingly.

3. The magnetorheological soft starter based on hemispherical centrifugal extrusion according to claim 1 is characterized in that: A brush slip ring is also sleeved on the driven shaft, the brush slip ring is fixedly connected to the driven shaft, and both ends of the excitation coil are connected to the brush slip ring.

4. The magnetorheological soft starter based on hemispherical centrifugal extrusion according to claim 1 is characterized in that: A liquid injection hole is arranged on the left shell body or the right shell body, and a liquid injection screw plug is matched in the liquid injection hole.

5. The magnetorheological soft starter based on hemispherical centrifugal extrusion according to claim 1 is characterized in that: The bearing is a sealed bearing.

6. The magnetorheological soft starter based on hemispherical centrifugal extrusion according to claim 1 is characterized in that: A blind cover is arranged at the left end of the driven housing, and the blind cover is fixedly connected to the left housing and closes the left housing; the driven shaft is fixedly connected to the blind cover.

7. The magnetorheological soft starter based on hemispherical centrifugal extrusion according to claim 1 is characterized in that: A transparent cover is arranged at the right end of the driven housing, the transparent cover is sleeved on the driving shaft and fixedly connected with the right housing, and a felt ring is arranged between the transparent cover and the driving shaft.

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